Method for positioning the wheeled carriage of a crane or the like cargo handling machine

ABSTRACT

A method for positioning the wheeled carriage of a crane or the like cargo-handling machine in which a spotlight device is mounted on said carriage and the carriage is positioned so that the focus of a ray of light from said spotlight device may be positioned right below the carriage. A mechanism for positioning the wheeled carriage of a crane or the like cargo-handling machine comprising a spotlight device mounted on said carriage and supporting an electric lamp having bases at the ends therein, said spotlight device being provided with cooling air passages which are effective to cool the bases thereby to positively cool the bases while cooling the lamp body itself to a lesser degree.

O Unlted States Patent 1 1 3,559,816

[72] Inventor Kiyotaka l'lirata [56] References Cited 15. 5. Z-chome llanazono-cho. Takamatsu. UNITED STATES PATENTS Kagawm Japan 1 712 650 5/1929 Clark 212/10 21 A 1. No 762,732 :22; l g Sept-26 1968 3.187.173 6/1965 Foley et a1. 353/57 45 p d F b, 2, 1971 Primary Examiner-Milton Buchler [32] Priority Sept. 30, 1967 Assistant Examiner-James E. Pittenger 33 Japan Attorney-Jerome Bauer [3 l 1 42/811,327

ABSTRACT: A method for positioning the wheeled carriage 54 METHOD FOR POSITIONING THE WHEELED 3 "F like ciggoharfgnng P which *3 CARRIAGE OF A CRANE OR THE LIKE CARGO 1g CV1C 1s mounte on sai carnage and the carnage 1s HANDLING MACHINE posItIoned so that the focus of a ray of light from said spotl1ght device may be positioned right below the carriage. A 4 l2 Drawmg Flgs' mechanism for positioning the wheeled carriage of a crane or [52] US. Cl 212/21, the like cargo-handling machine comprising a spotlight device 353/57; 240/47 mounted on said carriage and supporting an electric lamp hav- [51] Int. Cl ..B66c 17/00, ing bases at the ends therein, said spotlight device being pro- F2 1 v 29/00 vided with cooling air passages which are effective to cool the [50] Field of Search 212/ 10, 11, bases thereby to positively cool the bases while cooling the lamp body itself to a lesser degree.

PATENiEU FEB 2m n I "-rsum a ura 1 N VEN "roe Kl Y0 TA HA l-l/RA TA ATTORNE y sls selsis b METHOD FOR POSITIONING THE WHEELED CARRIAGE OF A CRANE OR THE LIKE CARGO HANDLING MACHINE BACKGROUND OF THE INVENTION In the operation of any of the conventional cargo-handling machines, both the movement of such a cargo-handling machine to a proper cargo picking-up position relative to a cargo to be handled thereby and the lowering of the picked-up cargo to a predetermined location have been exclusively effected by the intuition on the part of the machine operator and by a sign given by a worker assigned to handle the cargo.

However, such conventional operation of the cargo-handling machine has very often proved unsatisfactory because the movement of the cargo-handling machine to a desired proper cargo picking-up position which depends upon the operators intuition have required experienced personal and often failed to position the machine correctly and furthermore, such positioning by the operators intuition have required many trials before the machine would be properly positioned relative to a cargo to be handled thereby.

SUMMARY OF THE INVENTION The present invention relates to a method and mechanism for positioning the carriage of a crane, hoist or the like cargohandling machine and more particularly, to an improved method and mechanism for positioning the carriage of such a cargo-handling machine in which the position of the carriage or more particularly a hook thereon is clearly lit by a spotlight device adjustably mounted on the carriage whereby the operation on the handling machine for picking the cargo up and moving the cargo to a desired location can be easily performed.

One object of the present invention is to provide a method and mechanism for positioning the carriage of a cargo-handling machine by mounting a spotlight device having a high brilliance capacity on the carriage and promptly determining the position of the carriage relative to a cargo to be handled thereby by means of a ray of light emitted from the spotlight device.

Another object of the present invention is to provide a method and mechanism for positioning the carriage of a cargo-handling machine in which the center of a hook or like cargo picking-up means is aligned with the center of gravity of the cargo by means of a ray of intensive light to be emitted from a spotlight device adjustably mounted on the carriage whereby the cargo picking-up operation can be smoothly effected and the cargo can be positively moved to and lowered on a desired location.

A further object of the present invention is to provide a method and mechanism for positioning the carriage of a cargo-handling machine which can effectively eliminate the disadvantages inherent in the conventional corresponding machines and which can easily determine the position of a hook supported by the carriage relative to a cargo to be handled thereby by means of the light from an electric lamp whereby the cargo-handling operation can be greatly accelerated and at the same time prevent occurence of hazards which may otherwise occur in handling the cargo.

According to the present invention, there is provided a method for positioning the winch-carrying wheeled carriage of a crane or the like cargo-handling machine in which a spotlight device is mounted on said wheeled carriage and the position of said carriage is so determined that the focus of a ray of light emitted from said spotlight device may be positioned right below the carriage.

Furthermore, according to the present invention, there is also provided a mechanism for positioning the winch-carrying wheeled carriage of a crane or the like cargohandling machine adapted to determine that said carriage has been positioned right above the center of gravity of a cargo to be hoisted by the crane, said mechanism comprising a spotlight device adjustably mounted on said carriage; and a electric bulb assembly fixedly housed in said spotlight device by means of a hollow cylindrical member and including an electric bulb which has bases at the opposite ends; and a cooling fan provided on said spotlight device right above said electric bulb assembly for cooling the electric bulb of said assembly. said hollow cylindrical member being provided with cooling air passages in positions opposite to said bases of the electric bulb for guiding a flow of cooling air from said fan to the bases whereby the bases may be positively cooled, but the bulb itself may be prevented from being positively cooled.

The above and other objects and advantages of the present invention will be more readily apparent to those skilled in the art from the following description when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevational view of a crane in which a preferred form of wheeled carriage positioning mechanism according to the present invention is mounted;

FIG. 2 is an enlarged vertical section view of a spotlight device employed in said positioning mechanism of FIG. 1 as seen from the front thereof;

FIG. 3 is a vertical section view of said spotlight device of FIG. 2 as seen from one side thereof;

FIG. 4 is a schematic view of a modified fomi of spotlight device according to the present invention;

FIG. 5 is an enlarged vertical section view of said modified spotlight device of FIG. 4 as seen from one side thereof showing the details of the device;

FIG. 6 is a front elevational view of a specific electric bulb assembly employed in said modified spotlight device of FIG. 5 on a further enlarged scale;

FIG. 7 is a plan view of the support structure of said specific electric bulb assembly of FIG. 5;

FIG. 8 is a side elevational view of said support structure of FIG. 7;

FIG. 9 is a plan view of said support structure with bolts, nuts and associated parts removed therefrom in order to show the position of holes therein;

FIG. 10 is a vertical section view of a further modified form of spotlight device according to the present invention as seen the front thereof;

FIG. 11 is an exploded cross-sectional view of said spotlight device of FIG. 10; and

FIG. I2 is a view showing the relationship between a reflector and an electric lamp.

. PREFERRED EMBODIMENTS OF THE INVENTION The present invention will now be described referring to the accompanying drawings in which several preferred embodiments of the present invention are shown for illustration only, but not to limit the scope of the invention.

Referring first to FIG. 1 of the drawings, in this FIG, the present invention is illustrated as being employed in conjunction with a conventional overhead travelling crane which generally comprises a main body 1 which carriages on the bottom at the opposite ends thereof wheels 3 and 3 which ride on and run along the rails 4 and 4 which are provided on suitable overhead supporting members of the structure of a factory of the like building such as ceiling beams where a desired operation is carried out. Therefore, the crane body 1 may be displaced along the overhead support members of the building by means of the wheels 3 as the wheels move along the rails 4 in a conventional manner.

The crane body 1 is provided on the upper surface thereof with rails (not shown) on which a conventional wheeled hoist carriage 2 is movably supported and the carriage 2 has a winch (not shown) and wheels 5 which ride on and run along the crane body rails. Thus, the wheeled carriage 2 is movable in a direction substantially at right angles with respect to that in which the crane body 1 moves along. The carriage 2 has a spotlight device adjustably mounted thereon and further detailed descriptlon of the spotlight device will be made hereinafter. The winch supports a conventional winch drum (not shown) thereon and a rope 7 is wound on the drum to be payed out of and taken up on the drum and the rope supports at the lower end a block 7' which in turn supports a hook 8 at the lower end.

In FIG. 1. reference character F denoted an article or cargo which is usually heavy in weight to be picked up by the hook 7 for ultimate removal out of the factory or to any desired location by the crane. For the purpose, the crane body 1 is first moved along the supporting members of the building by means of the rails 4 and the crane wheels 3 to a location where the crane is most conveniently positioned for handling the article and then the wheeled carriage 2 is moved along the crane body 1 at a position substantially right above the article F by means of the rails on the crane body and the carriage wheels 5. Thereafter, the spotlight device is energized to cause the device to shed a spotlight on the surface of the article F in the manner will be described hereinbelow.

When energized, the spotlight device turns on its electric lamp which in turn projects a vertical ray of light on the surface of the article F. The spotlight device lamp is so designed that the ray of light projected thereby may pass in the same direction in which the extension of the rope 7 is payed out of the winch.

Thereafter, the carriage 2 is again moved along the crane body 1 by a distance depending upon the position of the carriage 2 relative to the article F, i.e., the carriage 2 is moved along the crane until the projected light is positioned substantially in the center of gravity of the article.

When the light has been positioned in the desired center of gravity of the article F, the winch drum is driven by any conventional drive means (not shown) so as to pay out the rope 7 therefrom until the hook 8 comes into contact or substantially into contact with the article F which has a wire or rope (not shown) wound thereabout in a conventional manner for convenience of transport or removal of the article. When the rope 7 has been payed out of the winch drum to a distance sufficient to cause the hook 8 to contact or substantially contact the surface of the article F, an operator grips the hook and passes the hook underneath the wire wound on the article F whereby the article may be ready for removal.

Although only one hook 8 is employed in the illustrated embodiment, two or more hooks arranged in an array can be employed in the carriage positioning mechanism by the present invention when an article F to be handled thereby has an exceedingly heavy weight or an extra large size. In such a case, the ray of light is caused to pass substantially through the mid point of the array of hooks and it is not necessary that the light ray and the hooks extend in the same vertical plane.

FIGS. 2 and 3 show the'details of one form of spotlight device of the present invention. In the embodiment of these FIGS., an electric bulb or lamp 1] is vertically received and held in position in a suitable manner within an outer hollow cylindrical member 10 having spaced radiating fins 9 surrounding the outer periphery thereof and a pair of condensing lenses 12 are also received and held in position wherein the cylindrical member 10 in a suitable manner with the convex surfaces of both the lenses facing to each other in a spaced relation. The cylindrical member 10 has an integral enlarged diameter cylindrical extension 13 at the lower end and the cylindrical extension is provided a pinhole 14 spaced from the lower lens on the top wall in a position opposite to the center of the lenses 12 to receive a ray of light from the electric bulb 11 through the lenses 12.

The open lower end of the cylindrical extension 13 receives and holds a larger diameter lens 15 in position with the flat lower surface of the lens lying in the same plane as that in which the lower edge of the cylindrical extension 13 lies. The cylindrical member 10 is provided at the top end with a suitable vertically extending fitting 16 having a pair of ears each of which has a hole and a fitting 16 is connected to a hanging member 17 fixedly attached to the wheeled carriage 2 and having a depending portion provided with a corresponding hole. A pin 18 extends the holes in the ears of the fitting 16 and the hole in the depending portion of the hanging member 17 so as to dependably support the cylindrical member 10 and the elements received in the member by the carriage 2 for movement together with the carriage.

FIGS. 4 to 9 inclusive show a modified form of spotlight device of the presentinvention which is especially suitable to employ a specific electric bulb or lamp having a high brilliance and a point source of light characteristic. A specific electric bulb 11' having bases 19 and 20 at the opposite ends is received and held in position within a hollow cylindrical member 24. When such a specific electric bulb 11 is employed, it has been the conventional practice that starter condensers 25 and a stabilizer 26 (FIG. 4) are also received and in held within the hollow cylindrical member 24.

However, it has been found that such an arrangement is very disadvantageous because the space within the cylindrical member 24 for mounting the condensers 25 and stabilizer 26 is narrowly limited and it is very inconvenient to provide access to the elements for maintenance. Therefore, according to the present invention; the starter condensers 26 and stabilizer 26 are integrally mounted on the top of the hollow cylindrical member 24 so as to construct the spotlight device with a compact unitary unit.

In the embodiment of spotlight device of FIGS. 4 to 9 inclusive, in order that the interior of the hollow cylindrical member 24 may be protected against a high temperature which may occur because of the operation of the starter condensers 25, a cooling fan 21 is disposed above the condensers 25 so that a flow of cooling air a cooling fan 21 is disposed above the condensers 26.so that a flow of cooling air may be driven from the upper portion to the lower portion of the cylindrical member 24 so as to forcibly cool the interior of the cylindrical member.

The forced cooling system or fan 21 is adapted to drive a flow of cooling air to pass about the electric bulb 11 within the interior of the hollow cylindrical member 24 and then to discharge out of the member as indicated with the arrows in FIG. 5. Although the electric bulb l l is positively cooled only at the bases 19 and 20 while the main body of the bulb 11' itself may not be excessively cooled, the cooling is effected in the following way.

A flow of cooling air from the fan 21 first cools the starter condensers 25 and then passes through a plurality of air holes 23 provided in an electric bulb mounting or hanging member 22. The air holes 23 are in angularly spaced relation about the center of the bulb mounting which covers the open top of the cylindrical member 24. The cooling air flows into a cooling air guide cylindrical member 29 which is fixedly mounted on the upper edge of the cylindrical member 24 and tapers upwardly. The guide cylindrical member 29 is provided in its peripheral wall with a plurality of holes 28' through which the cooling air, which has passed the guide cylindrical member and cooled the upper base 19, passes into a plurality of downwardly inclined holes 28" provided in the peripheral wall of the cylindrical member 24 to cool the lower base 20.

Thereafter, the cooling air flow flows down within the cylindrical member 24 into the interior of an enlarged diameter hollow cylindrical extension 24' connected to the lower end of the cylindrical member 24 and then discharges through a plurality of holes 30 provided in the peripheral wall of the cylindrical extension 24' out of the system. With the above arrangement of the cooling system, the bases 19 and 20 of the electric bulb 11' may be forcibly cooled while the bulb body itself may be moderately cooled.

As shown in FIG. 5, the starter condensers 25 are received and held in position within a casing 31 in a suitable manner and the casing receives and supports the above-mentioned cooling fan 21 therein in a suitable manner. The casing 31 is connected at the bottom end to the upper end of the enlarged diameter extension 24" of the cylindrical member 24 by means of bolts, for example and the bolts extend through the threaded bores in the bottom peripheral edge of the casing 31 and those in an annular peripheral flange surrounding the peripheral wall of the upper extension 24" of the cylindrical member 24. The above-mentioned electric bulb II" is dependably supported within the upper cylindrical member extension 24" by the above-mentioned mounting member 22.

A parabolic concave reflector 33 is received and held in position in a suitable manner within the tapered cooling air guide cylindrical member 19 surrounding the upper portion of the electric bulb 1 I in a spaced relation thereto and a ray of light from the electric bulb II is reflected by the concave reflector 33 as shown with the chain lines in FIG. 5. The reflected light ray is then focused in and passes through a pinhole 34 provided in the partition between the cylindrical member proper and the lower extension. The light ray then passes through a convex lens 35 provided at the bottom of the lower extension 24' with the convex surface extends beyond the lower edge of the lower extension 24' to project a spotlight upon the surface of the article F positioned below the spotlight device.

The main body 1 of the crane or the like cargo handling machine (see FIG. I) has a suitable support plate 36 to which a mounting plate 37, for the spotlight device, is adjustably connected by means of three adjusting bolts 38. The bolts 38 extend through the corresponding threaded bores in the mounting plate 37 provided in an equally angular spaced relation to one another, and then nuts 39 are threaded on the bolts, whereby the angular position of the spotlight device relative to the crane and carriage may be adjusted by manipulation of the adjusting bolts 38.

In order to mount the cylindrical member 24 having the above-mentioned associated parts assembled thereto on the mounting plate 37, an annular flange 40 is provided surrounding the peripheral wall of the upper enlarged diameter cylindrical extension 2 The flange is provided with three threaded bores 42 in an equally angular spaced relation, the position of which corresponds to the three threaded bores in the mounting plate 37, for receiving the bolts 38. Another set of three threaded bores 44 are also provided in the mounting plate 37 in an equally angular spaced relation to one another, but in an alternative relation to the first-mentioned three threaded bores 42 in the same mounting plate whereby each of the bores 44 is positioned between two adjacent bores 42.

The bolts 38 are threaded through the bores 42 and the nuts 39 threaded on the bolts 38 and another set of three bolts 43 are threaded through the bores 44 until the leading ends of the bolts come to contact the mounting plate 37. By turning the bolts 38 and 43 in one or other direction the inclination angle of the spotlight device, and accordingly the electric bulb 11', may be adjusted to any suitable light projection position. After the adjustment of the inclination angle of the bulb 11', the nuts are again tightened to fixedly secure the cylindrical member 24 to the mounting plate 37.

FIGS. and 12 show a modified form of mounting structure of the spotlight device. As mentioned above, the carriage positioning device of the present invention is especially adapted to employ an electric bulb having a high brilliance and a point source of light characteristic and after the spotlight device has been positioned it is necessary to further adjust the position of the spotlight device so that the bulb might be aligned with the focus on the condensing nonspherical surfaced reflector. The mounting structure of FIGS. 10 and 12 is suitably employed for such an adjustment.

As shown in FIG. 12, the point source of light of the electric lamp 11 is in the form of a discharge tube having the arc length II of 2 mm. and the distance between the lower end of the upper base 19 and the center of the point source of light is indicated by the character I with :t 1.5 or 1 mm., and accordingly, it is absolutely necessary to align the focus of the reflector 33 with the point source of light. However, in practice it is very difficult to determine the position of the focus. When the lamp 11' is turned on without the alignment of the focus of the reflector with the point source of light the reflection coefficient is too low for practical use.

And if a users finger tip touches the discharge tube ll during the handling of the tube, the service life of the discharge tube may be shortened and therefore, if his finger tip touched the discharge tube 11' accidentally it is necessary to wipe off the finger print from the tube with alcohol. Accordingly, the discharge tube I1 requires very prudent handling.

In order to obtain the ray of light as shown with the chain line III in FIG. 10, it is necessary to align the point source of light of the lamp 11' with the focus of thereflector 33. When the lamp 11' is replaced by a new lamp and then the point source of light of the new lamp is to be aligned with the focus of the reflector 33. If such an aligning operation is effected, based on the operators intuition, the aligning operation will very often result in failure and, if any, the alignment obtained by such procedure will not be satisfactory requiring a further adjustment after the aligning operation. Furthermore, the adjustment and handling of such a discharge tube require complicated procedures which lead to an uneven brilliance in the projected light which is unserviceable for practical purpose.

Therefore, in order to eliminate the above-mentioned disadvantages, according to the embodiment of FIGS. 10 and 12 inclusive of the present invention, the lamp I1 and reflector 33 are unitarily and fixedly mounted within a hollow holder 50. When the lamp 11' is replaced by a new lamp, the holder 50 is removed from the flange 51 closing the open top of the hollow cylindrical member 24 which receives a convex lens 35 therein at the lower end. In other words, the lamp ll, reflector 33 and holder 50 can be removed from the cylindrical member 24 as one unit and then the lamp 1 l' is removed from the unit. Thereafter, a new lamp is mounted in the cylindrical member 24 thereby to eliminate the necessity for aligning between the point of the lamp source of light and the focus of the reflector, and the handling of the lamp is very simple.

In the embodiment of FIGS. 10 to 12 inclusive, the bottom surface of the holder 50 is recessed at 52 along the peripheral edge so as to provide an annular shoulder and the upper surface of the flange 51 is also compensatively recessed at 53 for receiving the shoulder 52 in the holder 50 whereby the holder receiving the lamp 11' and reflector therein can be held in position on the flange 51. A compressed spring 54 is provided between the underside of the cover 55 closing the open top of the holder 50 and the convex surface of the reflector 33 so that the reflector is normally held down. The lamp 11' is dependably supported from the cover 55 and the upper portion of the lamp is surrounded by the spring. The lower or flat surface of the reflector 33 is therefore urged against the annular base 56 formed along the inner periphery of the holder 50 adjacent to the lower edge of the holder. The reflector 33 has a center bore 57 through which the lamp 11' extends and the ray of light from lamp 11' is reflected by the reflector 33 and passes through a center pinhole 59 provided in a shield disc 58 extending across the interior of the cylindrical member 24 thereby to obtain the ray of light as indicated with the chain line III in FIG. 10.

As clear from the foregoing, the novel carriage-positioning mechanism device can perform the positioning operation rapidly by moving the crane to a position most convenient to pick up an article to be handled thereby along the support structure of a building and then by moving the carriage which supports the spotlight device to a position substantially right above the article relative to the crane, and the novel mechanism is more advantageous and reliable over the corresponding prior art carriage-positioning mechanism in which a worker who is assigned to handle the article gives a signal based on his intuition to another worker who is assigned to operate the crane so as to position the carriage to a desired position right above the article.

Although the certain preferred embodiments of the present invention have been described and illustrated herein, it is to be understood that these are illustrative in nature and not to be necessarily limiting upon the scope of these teachings in their broader aspects. Many additional variations within the scope of the appended claims will occur to those skilled in the art.

I claim:

l. The combination of a spotlight device on a winchcarrying wheeled carriage having cargo-carrying means, the invention comprising:

a mounting member to mount said spotlight device on said carriage to position its ray of light at a point of contact between the cargo-carrying means and the cargo to be carried thereby;

a hollow cylindrical member supported on said mounting member;

double base bulb light emitting means having a base in said mounting member and in said hollow member respectively;

said cylindrical member having lens means supported therein and a pin point opening in said cylindrical member between said lens and light emitting means to permit a'pin point ray of light from said light emitting means to pass through said lens means to focus the ray of light at said point of contact between the cargo-carrying means and the cargo to be carried thereby;

said mounting member and hollow cylindrical member each being provided with air holes to direct cooling air at the base of said double base bulb mounted in said respective member; and

a cooling fan on said spotlight device directly above said mounting member and directing a flow of cooling air through said air holes in said mounting member and said hollow cylindrical member toward said bases respectively of said bulb in said mounting member and cylindrical member in sequence to cool said bases without directing the air at the bulb body to cool the same.

2. A spotlight device as in claim 1:

a reflector in said cylindrical member to reflect the light rays of said bulb; and

a holder to hold said reflector and bulb integrally secured together and to said holder in said cylindrical member.

3. A spotlight device as in claim 2, said holder having air holes defined therein to permit the passage of cooling air therethrough.

4. A spotlight device as in claim 2, said holder unitarily mounting said reflector and bulb, and means between said holder and reflector urging said reflector into reflecting relation with said bulb.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 559 8] 6 Dated February 2 1971 Inventofls) JCLYQTAKA HIRATA It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 1, line 2 change "cargo-carrying" to --cargo carryin Claim 1, line 3, at the end of "comprising", delete the col Claim 1, line 6 change "cargo-carrying" to -cargo carryin Claim 1, line 7 after "thereby", delete the semicolon and substitute a comma Claim 1, line 9, after "member" delete the semicolon and substitute a comma Claim 1, line 12, after "respectively" delete the semicolo and substitute a comma Claim 1, line 18, change "cargo-carrying" to --cargo carryi Claim 1, line 19, after "thereby", delete the semicolon and substitute a comma I Claim 1, line 23, after "member" delete the semicolon and substitute a comma Claim 2, line 1, after "1" delete the colon and substitute a comma Claim 2, line 3, after "bulb", delete the semicolon and substitute a comma Signed and sealed this 25th day of May 1 971 (SEAL) Attest:

EDWARD M.FLETCHER,JR. WILLIAM E. SGHUYLER Attesting Officer Commissioner of Pat 

1. The combination of a spotlight device on a winch-carrying wheeled carriage having cargo-carrying means, the invention comprising: a mounting member to mount said spotlight device on said carriage to position its ray of light at a point of contact between the cargo-carrying means and the cargo to be carried thereby; a hollow cylindrical member supported on said mounting member; double base bulb light emitting means having a base in said mounting member and in said hollow member respectively; said cylindrical member having lens means supported therein and a pin point opening in said cylindrical member between said lens and light emitting means to permit a pin point ray of light from said light emitting means to pass through said lens means to focus the ray of light at said point of contact between the cargo-carrying means and the cargo to be carried thereby; said mounting member and hollow cylindrical member each being provided with air holes to direct cooling air at the base of said double base bulb mounted in said respective member; and a cooling fan on said spotlight device directly above said mounting member and directing a flow of cooling air through said air holes in said mounting member and said hollow cylindrical member toward said bases respectively of said bulb in said mounting member and cylindrical member in sequence to cool said bases without directing the air at the bulb body to cool the same.
 2. A spotlight device as in claim 1: a reflector in said cylindrical member to reflect the light rays of said bulb; and a holder to hold said reflector and bulb integrally secured together and to said holder In said cylindrical member.
 3. A spotlight device as in claim 2, said holder having air holes defined therein to permit the passage of cooling air therethrough.
 4. A spotlight device as in claim 2, said holder unitarily mounting said reflector and bulb, and means between said holder and reflector urging said reflector into reflecting relation with said bulb. 